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ATmega128
Table 90. Status Codes for Slave Receiver Mode
Status Code
Application Software Response
(T W SR)
Prescaler Bits
are 0
$60
Status of the Two-wire Serial Bus
and Two-wire Serial Interface
Hardware
Own SLA+ W has been received;
To/from T W DR
No T W DR action or
To T W CR
STA
X
STO
0
T W INT
1
T W EA
0
Next Action Taken by T W I Hardware
Data byte will be received and NOT ACK will be
ACK has been returned
returned
No T W DR action
X
0
1
1
Data byte will be received and ACK will be returned
$68
Arbitration lost in SLA+R/ W as
No T W DR action or
X
0
1
0
Data byte will be received and NOT ACK will be
master; own SLA+ W has been
returned
received; ACK has been returned
No T W DR action
X
0
1
1
Data byte will be received and ACK will be returned
$70
General call address has been
No T W DR action or
X
0
1
0
Data byte will be received and NOT ACK will be
received; ACK has been returned
returned
No T W DR action
X
0
1
1
Data byte will be received and ACK will be returned
$78
Arbitration lost in SLA+R/ W as
No T W DR action or
X
0
1
0
Data byte will be received and NOT ACK will be
master; General call address has
returned
been received; ACK has been
No T W DR action
X
0
1
1
Data byte will be received and ACK will be returned
returned
$80
Previously addressed with own
Read data byte or
X
0
1
0
Data byte will be received and NOT ACK will be
SLA+ W ; data has been received;
returned
ACK has been returned
Read data byte
X
0
1
1
Data byte will be received and ACK will be returned
$88
Previously addressed with own
Read data byte or
0
0
1
0
Switched to the not addressed slave mode;
SLA+ W ; data has been received;
no recognition of own SLA or GCA
NOT ACK has been returned
Read data byte or
0
0
1
1
Switched to the not addressed slave mode;
own SLA will be recognized;
GCA will be recognized if T W GCE = “1”
Read data byte or
1
0
1
0
Switched to the not addressed slave mode;
no recognition of own SLA or GCA;
a START condition will be transmitted when the bus
becomes free
Read data byte
1
0
1
1
Switched to the not addressed slave mode;
own SLA will be recognized;
GCA will be recognized if T W GCE = “1”;
a START condition will be transmitted when the bus
becomes free
$90
Previously addressed with
Read data byte or
X
0
1
0
Data byte will be received and NOT ACK will be
general call; data has been re-
returned
ceived; ACK has been returned
Read data byte
X
0
1
1
Data byte will be received and ACK will be returned
$98
Previously addressed with
Read data byte or
0
0
1
0
Switched to the not addressed slave mode;
general call; data has been
no recognition of own SLA or GCA
received; NOT ACK has been
Read data byte or
0
0
1
1
Switched to the not addressed slave mode;
returned
own SLA will be recognized;
GCA will be recognized if T W GCE = “1”
Read data byte or
1
0
1
0
Switched to the not addressed slave mode;
no recognition of own SLA or GCA;
a START condition will be transmitted when the bus
becomes free
Read data byte
1
0
1
1
Switched to the not addressed slave mode;
own SLA will be recognized;
GCA will be recognized if T W GCE = “1”;
a START condition will be transmitted when the bus
becomes free
$A0
A STOP condition or repeated
No Action
0
0
1
0
Switched to the not addressed slave mode;
START condition has been
no recognition of own SLA or GCA
received while still addressed as
0
0
1
1
Switched to the not addressed slave mode;
slave
own SLA will be recognized;
GCA will be recognized if T W GCE = “1”
1
0
1
0
Switched to the not addressed slave mode;
no recognition of own SLA or GCA;
a START condition will be transmitted when the bus
becomes free
1
0
1
1
Switched to the not addressed slave mode;
own SLA will be recognized;
GCA will be recognized if T W GCE = “1”;
a START condition will be transmitted when the bus
becomes free
220
2467X–AVR–06/11
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